How can I hibernate or sleep my Ubuntu 10.10 desktop and have it "wake up" the next day?
I have seen software that can do this on windows, so it can't be hard on Ubuntu!
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The command that you are interested in is
This program is used to enter a system sleep state until specified wakeup time.
To find the correct syntax that works for you try the following:
sudo rtcwake -u -s 60 -m mem
This should suspend the computer for 60 seconds before restoring. The significant parameter is
mem You have several options you can choose - play to find the value that works best for you:
standby ACPI state S1. This state offers minimal, though real, power savings, while providing a very low-latency transi‐ tion back to a working system. This is the default mode. mem ACPI state S3 (Suspend-to-RAM). This state offers signif‐ icant power savings as everything in the system is put into a low-power state, except for memory, which is placed in self-refresh mode to retain its contents. disk ACPI state S4 (Suspend-to-disk). This state offers the greatest power savings, and can be used even in the absence of low-level platform support for power manage‐ ment. This state operates similarly to Suspend-to-RAM, but includes a final step of writing memory contents to disk. off ACPI state S5 (Poweroff). This is done by calling '/sbin/shutdown'. Not officially supported by ACPI, but usually working. no Don't suspend. The rtcwake command sets RTC wakeup time only. on Don't suspend, but read RTC device until alarm time appears. This mode is useful for debugging.
A script (at the bottom of this post) could be used to suspend your computer and wake at a specific time:
suspend_until [hh:mm] for example
sudo ./suspend_until 07:30
Save the script as the name
suspend_until and give it execute rights i.e.
chmod +x suspend_until
You can create a root cron job that calls this script to execute at a specific time in the evening and then awake in the morning:
sudo crontab -e
Now enter something like to run the suspend script at 23:30:
30 23 * * * /home/myhomefolder/suspend_until 07:30
#!/bin/bash # Auto suspend and wake-up script # # Puts the computer on standby and automatically wakes it up at specified time # # Written by Romke van der Meulen <email@example.com> # Minor mods fossfreedom for AskUbuntu # # Takes a 24hour time HH:MM as its argument # Example: # suspend_until 9:30 # suspend_until 18:45 # ------------------------------------------------------ # Argument check if [ $# -lt 1 ]; then echo "Usage: suspend_until HH:MM" exit fi # Check whether specified time today or tomorrow DESIRED=$((`date +%s -d "$1"`)) NOW=$((`date +%s`)) if [ $DESIRED -lt $NOW ]; then DESIRED=$((`date +%s -d "$1"` + 24*60*60)) fi # Kill rtcwake if already running sudo killall rtcwake # Set RTC wakeup time # N.B. change "mem" for the suspend option # find this by "man rtcwake" sudo rtcwake -l -m mem -t $DESIRED & # feedback echo "Suspending..." # give rtcwake some time to make its stuff sleep 2 # then suspend # N.B. dont usually require this bit #sudo pm-suspend # Any commands you want to launch after wakeup can be placed here # Remember: sudo may have expired by now # Wake up with monitor enabled N.B. change "on" for "off" if # you want the monitor to be disabled on wake xset dpms force on # and a fresh console clear echo "Good morning!"
mem in this part of the script for whatever suspend method works for you:
# Set RTC wakeup time sudo rtcwake -l -m mem -t $DESIRED &
You may also have to substitute the
-u flag in place of the
-l flag depending on whether your hardware clock uses UTC (
-u) or local (
-l) time. Note that your hardware clock is different from the system clock you see in your operating system.
credit to redgeonline
Using rtcwake I have created a simple bash script. It uses php to translate natural language into system time. For example:
sudo ./cu "tomorrow 9am"
sudo ./cu "next monday 3pm"
sudo ./cu "1 hour ago"
rtcwake: time doesn't go backward
#!/bin/bash export sdate=$1 date=`/usr/bin/php << 'EOF' <?php date_default_timezone_set("Etc/GMT-2"); $date = strtotime(GETENV("sdate")); echo "\r".$date; EOF` rtcwake -m mem -t $date